drivers/irqchip/irq-ti-sci-intr.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Texas Instruments' K3 Interrupt Router irqchip driver
   4  *
   5  * Copyright (C) 2018-2019 Texas Instruments Incorporated - https://www.ti.com/
   6  *      Lokesh Vutla <lokeshvutla@ti.com>
   7  */
   8
   9 #include <linux/err.h>
  10 #include <linux/module.h>
  11 #include <linux/moduleparam.h>
  12 #include <linux/io.h>
  13 #include <linux/irqchip.h>
  14 #include <linux/irqdomain.h>
  15 #include <linux/of_platform.h>
  16 #include <linux/of_address.h>
  17 #include <linux/of_irq.h>
  18 #include <linux/soc/ti/ti_sci_protocol.h>
  19
  20 /**
  21  * struct ti_sci_intr_irq_domain - Structure representing a TISCI based
  22  *                                 Interrupt Router IRQ domain.
  23  * @sci:        Pointer to TISCI handle
  24  * @out_irqs:   TISCI resource pointer representing INTR irqs.
  25  * @dev:        Struct device pointer.
  26  * @ti_sci_id:  TI-SCI device identifier
  27  * @type:       Specifies the trigger type supported by this Interrupt Router
  28  */
  29 struct ti_sci_intr_irq_domain {
  30         const struct ti_sci_handle *sci;
  31         struct ti_sci_resource *out_irqs;
  32         struct device *dev;
  33         u32 ti_sci_id;
  34         u32 type;
  35 };
  36
  37 static struct irq_chip ti_sci_intr_irq_chip = {
  38         .name                   = "INTR",
  39         .irq_eoi                = irq_chip_eoi_parent,
  40         .irq_mask               = irq_chip_mask_parent,
  41         .irq_unmask             = irq_chip_unmask_parent,
  42         .irq_set_type           = irq_chip_set_type_parent,
  43         .irq_retrigger          = irq_chip_retrigger_hierarchy,
  44         .irq_set_affinity       = irq_chip_set_affinity_parent,
  45 };
  46
  47 /**
  48  * ti_sci_intr_irq_domain_translate() - Retrieve hwirq and type from
  49  *                                      IRQ firmware specific handler.
  50  * @domain:     Pointer to IRQ domain
  51  * @fwspec:     Pointer to IRQ specific firmware structure
  52  * @hwirq:      IRQ number identified by hardware
  53  * @type:       IRQ type
  54  *
  55  * Return 0 if all went ok else appropriate error.
  56  */
  57 static int ti_sci_intr_irq_domain_translate(struct irq_domain *domain,
  58                                             struct irq_fwspec *fwspec,
  59                                             unsigned long *hwirq,
  60                                             unsigned int *type)
  61 {
  62         struct ti_sci_intr_irq_domain *intr = domain->host_data;
  63
  64         if (fwspec->param_count != 1)
  65                 return -EINVAL;
  66
  67         *hwirq = fwspec->param[0];
  68         *type = intr->type;
  69
  70         return 0;
  71 }
  72
  73 /**
  74  * ti_sci_intr_xlate_irq() - Translate hwirq to parent's hwirq.
  75  * @intr:       IRQ domain corresponding to Interrupt Router
  76  * @irq:        Hardware irq corresponding to the above irq domain
  77  *
  78  * Return parent irq number if translation is available else -ENOENT.
  79  */
  80 static int ti_sci_intr_xlate_irq(struct ti_sci_intr_irq_domain *intr, u32 irq)
  81 {
  82         struct device_node *np = dev_of_node(intr->dev);
  83         u32 base, pbase, size, len;
  84         const __be32 *range;
  85
  86         range = of_get_property(np, "ti,interrupt-ranges", &len);
  87         if (!range)
  88                 return irq;
  89
  90         for (len /= sizeof(*range); len >= 3; len -= 3) {
  91                 base = be32_to_cpu(*range++);
  92                 pbase = be32_to_cpu(*range++);
  93                 size = be32_to_cpu(*range++);
  94
  95                 if (base <= irq && irq < base + size)
  96                         return irq - base + pbase;
  97         }
  98
  99         return -ENOENT;
 100 }
 101
 102 /**
 103  * ti_sci_intr_irq_domain_free() - Free the specified IRQs from the domain.
 104  * @domain:     Domain to which the irqs belong
 105  * @virq:       Linux virtual IRQ to be freed.
 106  * @nr_irqs:    Number of continuous irqs to be freed
 107  */
 108 static void ti_sci_intr_irq_domain_free(struct irq_domain *domain,
 109                                         unsigned int virq, unsigned int nr_irqs)
 110 {
 111         struct ti_sci_intr_irq_domain *intr = domain->host_data;
 112         struct irq_data *data;
 113         int out_irq;
 114
 115         data = irq_domain_get_irq_data(domain, virq);
 116         out_irq = (uintptr_t)data->chip_data;
 117
 118         intr->sci->ops.rm_irq_ops.free_irq(intr->sci,
 119                                            intr->ti_sci_id, data->hwirq,
 120                                            intr->ti_sci_id, out_irq);
 121         ti_sci_release_resource(intr->out_irqs, out_irq);
 122         irq_domain_free_irqs_parent(domain, virq, 1);
 123         irq_domain_reset_irq_data(data);
 124 }
 125
 126 /**
 127  * ti_sci_intr_alloc_parent_irq() - Allocate parent IRQ
 128  * @domain:     Pointer to the interrupt router IRQ domain
 129  * @virq:       Corresponding Linux virtual IRQ number
 130  * @hwirq:      Corresponding hwirq for the IRQ within this IRQ domain
 131  *
 132  * Returns intr output irq if all went well else appropriate error pointer.
 133  */
 134 static int ti_sci_intr_alloc_parent_irq(struct irq_domain *domain,
 135                                         unsigned int virq, u32 hwirq)
 136 {
 137         struct ti_sci_intr_irq_domain *intr = domain->host_data;
 138         struct device_node *parent_node;
 139         struct irq_fwspec fwspec;
 140         int p_hwirq, err = 0;
 141         u16 out_irq;
 142
 143         out_irq = ti_sci_get_free_resource(intr->out_irqs);
 144         if (out_irq == TI_SCI_RESOURCE_NULL)
 145                 return -EINVAL;
 146
 147         p_hwirq = ti_sci_intr_xlate_irq(intr, out_irq);
 148         if (p_hwirq < 0)
 149                 goto err_irqs;
 150
 151         parent_node = of_irq_find_parent(dev_of_node(intr->dev));
 152         fwspec.fwnode = of_node_to_fwnode(parent_node);
 153
 154         if (of_device_is_compatible(parent_node, "arm,gic-v3")) {
 155                 /* Parent is GIC */
 156                 fwspec.param_count = 3;
 157                 fwspec.param[0] = 0;    /* SPI */
 158                 fwspec.param[1] = p_hwirq - 32; /* SPI offset */
 159                 fwspec.param[2] = intr->type;
 160         } else {
 161                 /* Parent is Interrupt Router */
 162                 fwspec.param_count = 1;
 163                 fwspec.param[0] = p_hwirq;
 164         }
 165
 166         err = irq_domain_alloc_irqs_parent(domain, virq, 1, &fwspec);
 167         if (err)
 168                 goto err_irqs;
 169
 170         err = intr->sci->ops.rm_irq_ops.set_irq(intr->sci,
 171                                                 intr->ti_sci_id, hwirq,
 172                                                 intr->ti_sci_id, out_irq);
 173         if (err)
 174                 goto err_msg;
 175
 176         return out_irq;
 177
 178 err_msg:
 179         irq_domain_free_irqs_parent(domain, virq, 1);
 180 err_irqs:
 181         ti_sci_release_resource(intr->out_irqs, out_irq);
 182         return err;
 183 }
 184
 185 /**
 186  * ti_sci_intr_irq_domain_alloc() - Allocate Interrupt router IRQs
 187  * @domain:     Point to the interrupt router IRQ domain
 188  * @virq:       Corresponding Linux virtual IRQ number
 189  * @nr_irqs:    Continuous irqs to be allocated
 190  * @data:       Pointer to firmware specifier
 191  *
 192  * Return 0 if all went well else appropriate error value.
 193  */
 194 static int ti_sci_intr_irq_domain_alloc(struct irq_domain *domain,
 195                                         unsigned int virq, unsigned int nr_irqs,
 196                                         void *data)
 197 {
 198         struct irq_fwspec *fwspec = data;
 199         unsigned long hwirq;
 200         unsigned int flags;
 201         int err, out_irq;
 202
 203         err = ti_sci_intr_irq_domain_translate(domain, fwspec, &hwirq, &flags);
 204         if (err)
 205                 return err;
 206
 207         out_irq = ti_sci_intr_alloc_parent_irq(domain, virq, hwirq);
 208         if (out_irq < 0)
 209                 return out_irq;
 210
 211         irq_domain_set_hwirq_and_chip(domain, virq, hwirq,
 212                                       &ti_sci_intr_irq_chip,
 213                                       (void *)(uintptr_t)out_irq);
 214
 215         return 0;
 216 }
 217
 218 static const struct irq_domain_ops ti_sci_intr_irq_domain_ops = {
 219         .free           = ti_sci_intr_irq_domain_free,
 220         .alloc          = ti_sci_intr_irq_domain_alloc,
 221         .translate      = ti_sci_intr_irq_domain_translate,
 222 };
 223
 224 static int ti_sci_intr_irq_domain_probe(struct platform_device *pdev)
 225 {
 226         struct irq_domain *parent_domain, *domain;
 227         struct ti_sci_intr_irq_domain *intr;
 228         struct device_node *parent_node;
 229         struct device *dev = &pdev->dev;
 230         int ret;
 231
 232         parent_node = of_irq_find_parent(dev_of_node(dev));
 233         if (!parent_node) {
 234                 dev_err(dev, "Failed to get IRQ parent node\n");
 235                 return -ENODEV;
 236         }
 237
 238         parent_domain = irq_find_host(parent_node);
 239         if (!parent_domain) {
 240                 dev_err(dev, "Failed to find IRQ parent domain\n");
 241                 return -ENODEV;
 242         }
 243
 244         intr = devm_kzalloc(dev, sizeof(*intr), GFP_KERNEL);
 245         if (!intr)
 246                 return -ENOMEM;
 247
 248         intr->dev = dev;
 249         ret = of_property_read_u32(dev_of_node(dev), "ti,intr-trigger-type",
 250                                    &intr->type);
 251         if (ret) {
 252                 dev_err(dev, "missing ti,intr-trigger-type property\n");
 253                 return -EINVAL;
 254         }
 255
 256         intr->sci = devm_ti_sci_get_by_phandle(dev, "ti,sci");
 257         if (IS_ERR(intr->sci))
 258                 return dev_err_probe(dev, PTR_ERR(intr->sci),
 259                                      "ti,sci read fail\n");
 260
 261         ret = of_property_read_u32(dev_of_node(dev), "ti,sci-dev-id",
 262                                    &intr->ti_sci_id);
 263         if (ret) {
 264                 dev_err(dev, "missing 'ti,sci-dev-id' property\n");
 265                 return -EINVAL;
 266         }
 267
 268         intr->out_irqs = devm_ti_sci_get_resource(intr->sci, dev,
 269                                                   intr->ti_sci_id,
 270                                                   TI_SCI_RESASG_SUBTYPE_IR_OUTPUT);
 271         if (IS_ERR(intr->out_irqs)) {
 272                 dev_err(dev, "Destination irq resource allocation failed\n");
 273                 return PTR_ERR(intr->out_irqs);
 274         }
 275
 276         domain = irq_domain_add_hierarchy(parent_domain, 0, 0, dev_of_node(dev),
 277                                           &ti_sci_intr_irq_domain_ops, intr);
 278         if (!domain) {
 279                 dev_err(dev, "Failed to allocate IRQ domain\n");
 280                 return -ENOMEM;
 281         }
 282
 283         dev_info(dev, "Interrupt Router %d domain created\n", intr->ti_sci_id);
 284
 285         return 0;
 286 }
 287
 288 static const struct of_device_id ti_sci_intr_irq_domain_of_match[] = {
 289         { .compatible = "ti,sci-intr", },
 290         { /* sentinel */ },
 291 };
 292 MODULE_DEVICE_TABLE(of, ti_sci_intr_irq_domain_of_match);
 293
 294 static struct platform_driver ti_sci_intr_irq_domain_driver = {
 295         .probe = ti_sci_intr_irq_domain_probe,
 296         .driver = {
 297                 .name = "ti-sci-intr",
 298                 .of_match_table = ti_sci_intr_irq_domain_of_match,
 299         },
 300 };
 301 module_platform_driver(ti_sci_intr_irq_domain_driver);
 302
 303 MODULE_AUTHOR("Lokesh Vutla <lokeshvutla@ticom>");
 304 MODULE_DESCRIPTION("K3 Interrupt Router driver over TI SCI protocol");
 305 MODULE_LICENSE("GPL v2");